
In contrast, exchange server creates an OST (Offline Storage Table) file rather than PST (Personal Storage Table) file, and it remains in sync with the server. Based on the protocol (IMAP or POP3) used to download emails, the original copies may or may not be located on the server. MS Outlook stores your mailbox in a PST file (Outlook.pst) on your personal computer, which is called ‘Outlook data file’, and it is just a copy of your mailbox on the server. MS Outlook allows you configure your email account running on SMTP, IMAP or POP3 protocol, which means that you can set up your Gmail or Yahoo account on Outlook, while companies prefer using exchange server for email exchange. The biggest and the most advantageous feature provided by Outlook is the way it stores your mailbox, including emails, contacts, calendar, tasks, notes, journals, and everything else in your mailbox.



Most companies today prefer using Outlook for exchanging information over emails, as it is termed the most secure and reliable email client for desktops.
